I made a fairly large, heavy duty one that has a single runner slide on the
supporting jig. The blade stays vertical.
The jig is simply a 45 degree sled with 'T' slots for clamps to hold various
widths of boards. The board to be mitered is registered against a 'fence'
on the near side. This insures a 90 degree alignment of board to path of
blade. The clamps hold the work piece to the jig. You first cut your work
piece to just over length and slap it in jig and then push it through the
The first cut throught the blade also cuts the jig to fit the blade.
Voila! 45 degree miter up to the width of the jig. Length of board can be a
bit longer (sqrt of 2 times x) than the height of ceiling above table
saw...or move it outside for the really ambitious projects.
With 15" boards it is hard to get an accurate miter on the tablesaw. Very
easy on a good size router table with a 45 degree bit. The sled would be
good for narrower boards but the wide ones would be a lot easier on the
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